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Report Number 28232 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 8/30/2002 <br /> Project Name ROSSI <br /> Project Number 3490 <br /> Duplicate Spiked <br /> Duplicate Spiked Spiked Sample Relative <br /> Spike Spiked Spiked Sample Sample Relative Percent Percent <br /> Spiked Sample Spike Dup Sample Sample Analysis Date Percent Percent Percent Recov Diff <br /> Parameter Sample Value Level Level Value Value Units Method Analyzed Recov Recov Diff Limit Limit <br /> Benzene 28246-07 <0 50 400 400 452 436 ug/L EPA 82606 8128102 113 109 358 70-130 25 <br /> Toluene 28246-07 <0 50 400 400 386 373 ug/L EPA 82606 8/28102 965 932 348 70-130 25 <br /> Tert-Butanol 28246-07 <5 0 200 200 198 201 ug/L EPA 82606 8/28/02 99 3 100 1 32 70-130 25 <br /> Methyl-t-Butyl Ether 28246-07 <0 50 400 400 450 443 ug/L EPA 8260B 8128102 112 111 1 50 70-130 25 <br /> Approved By Joel Kiff <br /> KIFF ANALYTICAL, LLC <br /> 720 Olive Drive, Suite D Davis, CA 95616 530-2974800 I,l <br />